Modify path for python clang support package

Due to commit 594844244237091347b62e8fbbc8a2851258db50 (update
stable to r468909b) the path for python3-clang support was moved from
   prebuilts/clang/host/linux-x86/clang-stable/lib64/python3/site-packages
to:
   prebuilts/clang/host/linux-x86/clang-stable/lib/python3/site-packages

Change the imports to point to the correct place.

Without the change:
  Traceback (most recent call last):
    File "bionic/libc/kernel/tools/./clean_header.py", line 72, in <module>
      import sys, cpp, kernel, glob, os, re, getopt
    File "bionic/libc/kernel/tools/cpp.py", line 19, in <module>
      import clang.cindex
  ModuleNotFoundError: No module named 'clang'

Bug: 254401594
Test: execute clean_headers.py
Signed-off-by: Pat Tjin <pattjin@google.com>
Change-Id: Ibf1423fbe78ee009366e26905c4a09e68ac8ff9b
diff --git a/libc/kernel/tools/cpp.py b/libc/kernel/tools/cpp.py
index 1496231..40e1f26 100755
--- a/libc/kernel/tools/cpp.py
+++ b/libc/kernel/tools/cpp.py
@@ -14,7 +14,7 @@
     utils.panic('ANDROID_BUILD_TOP not set.\n')
 
 # Set up the env vars for libclang.
-site.addsitedir(os.path.join(top, 'prebuilts/clang/host/linux-x86/clang-stable/lib64/python3/site-packages/'))
+site.addsitedir(os.path.join(top, 'prebuilts/clang/host/linux-x86/clang-stable/lib/python3/site-packages/'))
 
 import clang.cindex
 from clang.cindex import conf
@@ -28,7 +28,7 @@
 
 # Set up LD_LIBRARY_PATH to include libclang.so, libLLVM.so, and etc.
 # Note that setting LD_LIBRARY_PATH with os.putenv() sometimes doesn't help.
-clang.cindex.Config.set_library_file(os.path.join(top, 'prebuilts/clang/host/linux-x86/clang-stable/lib64/libclang.so'))
+clang.cindex.Config.set_library_file(os.path.join(top, 'prebuilts/clang/host/linux-x86/clang-stable/lib/libclang.so'))
 
 from defaults import *